Regulating crystal structure and atomic arrangement in single-component metal oxides through electrochemical conversion for efficient overall water splitting

doi:10.1021/acsami.0c16659

淡江大學機構典藏 > 工學院 > 電機工程學系暨研究所 > 期刊論文 > Item 987654321/120715

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题名:	Regulating crystal structure and atomic arrangement in single-component metal oxides through electrochemical conversion for efficient overall water splitting
作者:	Zhang, X.;Dong, C. L.;Wang, Y.;Chen, J.;Arul, K. T.;Diao, Z.;Fu, Y.;Li, M.;Shen, S.
关键词:	water splitting;bifunctional electrocatalyst;transition metal oxides;electrochemical conversion reaction;crystal structure;atomic arrangement
日期:	2020-12-23
上传时间:	2021-05-05 12:11:53 (UTC+8)
摘要:	Single-component transition-metal oxide (TMO: FeOx, NiOx, or CoOx) nanosheets grown on nickel foam (NF) were electrochemically optimized with Li ion (Na ion)-induced conversion reaction for bifunctional electrocatalysis. The optimum FeOx/NF-Li electrocatalyst exhibits low overpotentials of 239 mV for hydrogen evolution reaction and 276 mV for oxygen evolution reaction at a current density of 100 mA cm–2. A two-electrode water splitting cell using FeOx/NF-Li as both anode and cathode requires only 1.60 V to achieve a current density of 10 mA cm–2. The impressive water splitting performance of the FeOx/NF-Li electrode is revealed to be attributed to Li-induced electrochemical conversion, which alters the crystal structure, creating more active sites for electrocatalytic reactions, as well as introduces O vacancies increasing the electron density and the intrinsic conductivity. More importantly, the atomic arrangement is regulated from tetrahedral Fe(Td) to octahedral Fe(Oh) coordination, which acts as catalytically active sites with reduced Gibbs free energy for the rate-determining steps. This electrochemical conversion reaction can be extended to other TMOs (i.e., NiOx/NF and CoOx/NF) for promoted electrocatalytic water splitting performances. This study provides an in-depth understanding on the nature of atomic and electronic structure evolution to promote the electrocatalytic activity.
關聯:	ACS Applied Materials & Interfaces 12(51), p.57038-57046
DOI:	10.1021/acsami.0c16659
显示于类别:	[電機工程學系暨研究所] 期刊論文

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